Just somethings we’ve learned from Bill from the AMA:

• He possibly had a family
• He seems to want a human form
• His real name isn’t Bill
• He’s keeping tabs on the Pines 
• He thinks Dippers real name is lame
• He encourages young girls to do drugs
• He curses 
• He drinks margaritas apparently  
• He dislikes Time Baby a lot
• He is incredibly erratic
• He thinks Wendy’s Mom has got it going on
• He can’t see how kids love the taste of Cinnamon Toast Crunch
• His idea of “pop culture” is old timey black and white music???
• Life has a taste and it is Uracil, Cytosine and thymine 
• Dipper has a long internet history of Red heads
• He has seen everyone naked but wishes he hadn’t 
• The goat maybe wasn’t always a goat….
• His friends are pictures of alphabet people 
• Not some classy gentlemen but he a huge nerd
• Bill seems to use big random words but many of them are references to real people or things